2Pcs Sofa Adjustable Height Angle Hardware Sofa Headrest Ratchet Multifunctional Adjustment Hinge 902Pcs Sofa Adjustable Height Angle Hardware Sofa Headrest Ratchet Multifunctional Adjustment Hinge 90-195 Degrees1. Material: The hinge is made of iron, which is strong and practical, not easy to rust, and not easy to deform.2. Easy to install, strong compatibility, not easy to fall off after installation.3. Thickened material, large bearing capacity, firm and reliable.good weighing performance, large force-bearing area, stable and durable, use at ease.4. The material used is strong enough to weigh the weight and is not easy to deform and has a long service life.